Difficulty Levels
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Difficulty Levels refer to how difficult it is to care for a species of fish. Difficulty Levels are formatted in the Infobar on each specie's page, as "Difficulty". Below are the levels of difficulty for taking care of species, and what they actually mean.

Note: A species does not need to have all factors of a level applied to it for it to be ranked under that level. For example, If a species does not require live food, but requires a species only tank, it can still fall under Intermediate.

In addition, species that have a high difficulty rank can still have aspects of lower rankings. For example, if a species requires a specific substrate, but also requires pre-prepared food, it would fall under the Experienced rank.

Difficulty Levels

Easy
Recommended for hobbyists who haven't kept a tank before/have done minimal fishkeeping. Species can cope with fluctuating environmental factors.

Factors of species that qualify for Easy:

  • Requires little experience to care for
  • Requires low maintenance
  • Requires water that is easy to maintain
  • Are very hardy

Moderate
Recommended for hobbyists who have kept fish for 1-3 years and/or have moderate experience/knowledge about fishkeeping. Species can cope with most fluctuating environmental factors.

Factors of species that qualify for Moderate:

  • Requires moderate experience to care for
  • Requires somewhat attentive maintenance
  • Requires being in a large group
  • Can be aggressive
  • Requires a specific substrate
  • Requires specific lighting
  • Are somewhat hardy

Intermediate
Recommended for hobbyists who have kept fish for 3-5 years and/or have much experience/knowledge about fishkeeping. Species requires stable environmental factors but can cope with some fluctuations.

Factors of species that qualify for Intermediate:

  • Requires much experience to care for
  • Requires attentive maintenance
  • Requires a species only tank
  • Require somewhat difficult to maintain water parameters
  • Requires live food

Experienced
Recommended for hobbyists who have kept fish for 5-10 years and/or have an abundant amount of experience/knowledge about fishkeeping. Species requires consistent environmental factors.

Factors of species that qualify for Experienced:

  • Requires years of experience to care for
  • Requires lots of maintenance
  • Requires pre-prepared food
  • Requires specific types of plant/coral life
  • Are prone to diseases
  • Requires difficult to maintain water parameters

Expert
Only for hobbyists who have kept fish for 10-15+ years and/or have an extreme amount of experience/knowledge about fishkeeping. Species requires constant/difficult to maintain environmental factors.

Factors of species that qualify for Expert:

  • Requires many years of experience to care for
  • Requires extreme maintenance
  • Stress can result in quick death of the animal
  • Require an extremely large and/or difficult/expensive to maintain tank/pond
  • Are very prone to diseases
  • Requires abnormal water parameters

Professional
Only for people who are professionally trained, should only be kept in a professionally maintained facility/environment, which has the funds/is capable of maintaining the environmental factors the species requires. Species requires extremely difficult and/or expensive to maintain environmental factors.

Factors of species that qualify for Professional:

  • Requires professional training to care for
  • Requires around the clock maintenance
  • Very prone to stress if not maintained correctly, which can result in death
  • Requires changing environmental factors, which are very expensive/difficult to maintain
  • Is too large to be kept in a tank that could be run in a home environment
  • Is a marine/freshwater mammal

Unethical
Species is not able to ethically be kept in captivity.

Factors of species that qualify for Unethical:

  • Requires environmental factors that are impossible to be replicated by humans.
  • Is too big to be kept in captivity
  • Being in captivity will result in constant stress
  • Is too complex to be kept in captivity
  • Travels to much to be kept in captivity
  • Can only be in captivity if is too injured/incapable of returning to the wild.
  • Many, many others

Undocumented
Species has not been recorded in captivity or has been recorded so scarcely that information about the species is unconfirmable.

If a species' difficulty is "Undocumented", it is required and qualifies for the "Wild" infobox.

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